Communications Minister Malcolm Turnbull has called for a conscience vote on same-sex marriage, admitting that the matter is ''very likely'' to come before Federal Parliament this term.

The call, which accentuates the distance between the moderate Mr Turnbull and his boss, Prime Minister Tony Abbott, came as the Greens party prepares for the reintroduction of a previously unsuccessful private member's bill.

The Greens hope to bring on a debate before the end of the year and to take the bill to a final vote by Valentine's Day next February.

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However, it remains unclear if the recently elected government will allocate sufficient time for private member's bills in the parliamentary schedule.

Greens senator Sarah Hanson-Young said she was working with sympathetic MPs from the two main parties and hoped to have a jointly sponsored bill initiated in the Senate, where its chances were best.

Mr Turnbull predicted the Liberal Party would be inclined to drop its previous approach of binding its frontbench in favour of allowing all MPs, including cabinet members, to vote in the Parliament, each according to their conscience.

''I think it is reasonably likely that there will be a free - the Coalition party room will make the decision, as Tony Abbott has said - that there will be a free vote from the Coalition, and presumably from the Labor Party as well,'' he said.

Despite a late switch in favour of legalising same-sex marriage by former prime minister Kevin Rudd, before the election Mr Abbott would go only as far as allowing his party room to decide the procedural question.

Like many Christian MPs on both sides of politics, Mr Abbott remains personally opposed, even though his sister, Christine Forster, is eager for law reform to allow her to marry.

The prospect of a free vote has raised such hopes but Mr Turnbull cautioned it was no guarantee of success, suggesting that even if Liberals had voted freely when the matter last came up there may have been too few Labor and Coalition MPs for a majority, especially in the lower house.

''But my view, as you know, is that we should have a free vote, and if we do agree to have a free vote, I will vote in favour of same-sex marriage,'' he told Ten's Meet the Press.

Several Liberals contacted on Sunday backed the move even if, in some cases, they were not inclined to support change to the Commonwealth Marriage Act.

Others were more circumspect, with Sydney MP Paul Fletcher responding that he would first want to see details of the proposed bill and then would seek the views of his Bradfield constituents.

Among those thought to favour a free vote, despite backing the current definition of marriage, is Treasurer Joe Hockey.

Mr Hockey has made his opposition known, arguing that it is in the best interests of children to be raised by a mother and a father.

Another Liberal, Josh Frydenberg, said marriage was just the kind of matter on which people with strong views should be given free expression.

''While I support the status quo, I also support a conscience vote, acknowledging the passionate views on this issue by those for and against,'' he told Fairfax Media.

Senator Hanson-Young said the best hope for change was through broad cross-party support.

She said she had spoken in recent weeks with Liberal and Labor MPs but declined to ''drop names'' because it was up to them to come forward if they so wished.

A bill to establish equality was rejected in September 2012 by a decisive 42-to-98 margin in the House of Representatives, but the vote was much closer in the Senate.

325 comments

Poor Malcolm. The Liberal Party hasn't been liberal since Honest John Howard turned it into the prototype of the Tea Party. The New World Order of The Abbott says: No.

Commenter

Jace

Date and time

November 04, 2013, 5:44AM

At least he can take his views to the party room. If they vote in favor of gay marriage it will be done. But I think Mr Abbott won't be silly enough unlike Ms Gillard to break this terms election promise. If the vote passes in the party room they will take it to the people next election, the honorable thing to do don't you think?

Better still have a referendum. Get the real answer. Problem solved.

Commenter

Beetle007

Date and time

November 04, 2013, 6:07AM

Summed up perfectly. No need for any other comment.You have it in a nutshell.

Commenter

A country gal

Date and time

November 04, 2013, 6:27AM

Hmmm... the Tea Party are homophobic, xenophobic and anti-tax... I wonder

Commenter

EFC fan

Location

Clayton, Victoria

Date and time

November 04, 2013, 6:44AM

As did the Labor party at the last vote!

Commenter

peter_qld

Location

Brisbane

Date and time

November 04, 2013, 6:51AM

Exactly!

Commenter

bayman

Date and time

November 04, 2013, 6:51AM

& so they should.

Commenter

Indeed

Date and time

November 04, 2013, 6:54AM

Absolutely, they are Liberals by name only, they should return to being called the Conservative Party.

Commenter

Scotty_16

Date and time

November 04, 2013, 6:58AM

Ha, great comment. Indeed, the Libs have shifted further to the right since Howard, and so has Labor. I've wondered for a while now if this is not a long term play by the Libs; move so far to the right your opponent has to follow you to compete.

Commenter

TechHead

Location

in your base

Date and time

November 04, 2013, 6:59AM

A conscience vote just for politicians?? How about a referendum so we all can express our opinion??I am sure the majority would reject that idea – but again – only minorities count these days.